in a genetics labratory, two heterozygous tall plants (Tt) are crossed. if tall (T) is dominant over short (t), what are the expected phenotypic results?
a ) 100% tall
b ) 50% tall, 50% short
c ) 75% tall, 25% short
d ) 25% tall, 75% short
The expected phenotypic results can be determined using a Punnett square.
The parents are both heterozygous tall plants (Tt). When the alleles are crossed, the possible genotypes of the offspring are: TT, Tt, Tt, and tt.
TT and Tt both have the genotype for tall (T), so they will exhibit the tall phenotype. Thus, 3 out of the 4 possible genotypes will result in a tall phenotype.
The correct answer is: c) 75% tall, 25% short